Leaves a clean hole at recommended RPM. The suitcase is good, all exercises are organized in it. My 1/2 drill doesn't develop the necessary speeds, so for me it's just a drill. The reason I didn't give 5 stars was that the surface of the flat cutting edges were showing where they needed touching up. The second reason was to try to make this a battery powered drill tool, the small shafts are 3/8 diameter and the drill bits were a little light and not as strong as I expected. I was fed up with the really horrible things in woodcraft so I gave them a try, time will tell how they hold up.